@media all and (min-width: 800px) and (max-width:1099px)  {
	/*左侧*/
	.left {
		top:0px;
		position:absolute;
		padding-bottom:10px;
		box-shadow:0px 0px 5px; 
		background-color: #394048;
		width: 200px;
	}
	/*中间*/
	.mid {	
		display:block;
		margin-left:220px;
		max-width: 860px;
		margin-right:20px;
	}
	/*用户栏*/
	.userbar{
		margin-left:200px;
		background: #394048;
		padding:14px;
		border-bottom: 1px solid #222; 
		border-top: 1px solid #222;
		border-left: 1px solid #222;
		box-shadow:0px 1px 1px; 
	}
	/*右侧*/
	.right{
		display: none;
	}
}